Cloudflare tracks exploitation and patching of eMudhra's weak intermediate CA keys
- Severity
- High
- Sources
- 1
What happened
Cloudflare reports that eMudhra's eight intermediate private keys, one of which was simply the number 4, can be recovered from the public certificates, letting anyone forge certificates that unpatched clients not enforcing Certificate Transparency would accept. Cloudflare patched high-priority systems, including Pingora origin-facing proxies, within hours and logged about 22,000 handshakes using the weak keys, all refused where verification was enabled. About 160 handshakes carried forged certificates, one dated less than an hour after Mozilla's bug report went public, but they appeared to be servers' own default certificates rather than interception attempts.
For IT people · Written by AI from 1 source · Wrong?
What to do
- Check whether you use the affected product, and install the vendor’s fix when it is available. Open your watchlist
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Who and what is in it
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